Counterfeit product is one explanation, but it is not the only one
cagrilintide was engineered to sit in the bloodstream for days at a time, with a half-life on the order of seven days
Lean muscle loss is also common due to rapid weight loss with GLP-1s

Water/Aqua/Eau, Glycerin, Isododecane, Cetearyl Alcohol, Niacinamide, Illite, Glyceryl Stearate, Candelilla/Jojoba/Rice Bran Polyglyceryl-3 Esters, Sodium Pca, Caffeine, Hydrogenated Polyisobutene, Polysilicone-11, Lactobacillus Ferment, Sodium Stearoyl Lactylate, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Butylene Glycol, Polyacrylate Crosspolymer-6, Synthetic Fluorphlogopite, 1,2-Hexanediol, Caprylyl Glycol, Lecithin, Panthenol, Tetrasodium Glutamate Diacetate, Sorbitan Isostearate, Malus Domestica Fruit Cell Culture Extract, Phenoxyethanol, Carbomer, Sodium Lactate, Ceteareth-25, Polysorbate 20, Caprylic/Capric Triglyceride, Ubiquinone, Sodium Hyaluronate, Potassium Sorbate, Xanthan Gum, Acetic Acid, Acetyl Hexapeptide-8, Acetyl Tetrapeptide-5, Ceteareth-6, Pterocarpus Marsupium Bark Extract, Cyanocobalamin, Stearyl Alcohol, Ethylhexylglycerin, Palmitoyl Tripeptide-1, Palmitoyl Tetrapeptide-7, Nicotiana Benthamiana Hexapeptide-40 Sh-Oligopeptide-1, Nicotiana Benthamiana Octapeptide-30 Sh-Oligopeptide-2, Titanium Dioxide (Ci 77891)

Mounjaro and Zepbound (tirzepatide) grow fastest with dual GLP-1/GIP action
Your provider can help decide whether continued treatment, maintenance dosing, or lifestyle strategies alone will work best for your situation